NdFeB "strong magnet" coatings are generally electroplated with nickel, copper, chromium, gold, black zinc, blue and white zinc, epoxy resin, etc. Electroplating is different, the color of the magnet surface will be different, and the storage time will also be different.
Ni, ZN, epoxy resin: The effects of Ni, ZN, epoxy resin and poly (p-xylene-C) coatings on the magnetic properties of NdFeB magnets in three solutions were studied.
The results show that in acid, alkali and salt environments, the protective effect of poly (p-toluene-C) polymer coating on magnets is the best, epoxy resin is the worst, NI coating is the second, and ZN coating is the worst.
Poly (p-xylene) is a new coating material developed by United Carbide Company in the mid-1960s. It is a p-xylene polymer. According to their different molecular structures, they can be divided into N, C, D, HT and so on. Each type has different characteristics, and the most suitable type should be selected according to the exact nature of the specific application. It can be applied to various shapes of surfaces and has good isolation and protection function in harsh environments such as salt spray, mould, moisture and corrosiveness. Characteristics of poly (p-xylene): This coating gradually forms a balanced, shape-preserving film that evenly covers the edges of the exposed substrate surface. The deposition of poly (p-xylene) does not produce liquid or gas by-products, nor does it require solvents or other materials subject to environmental requirements.
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